This is an investigational study. Decitabine is FDA approved and commercially available for the treatment of myelodysplastic syndrome (MDS). Interferon alfa-2b is FDA approved and commercially available for the treatment of several types of cancer, such as malignant melanoma, hairy cell leukemia, and non-Hodgkin's lymphoma. Their use together in this study in the treatment of PRC is investigational and authorized for use in research only.